{"page":"\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/resources-c03aa079.css\" /\u003e\n\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/lp_boclips_stylesheets-517835be.css\" media=\"all\" /\u003e\n\u003cdiv data-title='TUNA SHOWING SMALL LEVELS OF RADIATION FROM JAPAN TSUNAMI' data-url='/boclips/videos/5c54bc12d8eafeecae129e4b' data-video-url='/boclips/videos/5c54bc12d8eafeecae129e4b' id='bo_player_modal'\u003e\n\u003cdiv class='boclips-resource-page modal-dialog panel-container'\u003e\n\u003cdiv class='react-notifications-root'\u003e\u003c/div\u003e\n\u003cdiv class='rp-header'\u003e\n\u003cdiv class='rp-type'\u003e\n\u003ci aria-hidden='true' class='fai fa-regular fa-circle-play'\u003e\u003c/i\u003e\nVideo\n\u003c/div\u003e\n\u003ch1 class='rp-title' id='video-title'\u003e\nTUNA SHOWING SMALL LEVELS OF RADIATION FROM JAPAN TSUNAMI\n\u003c/h1\u003e\n\u003cdiv class='rp-actions'\u003e\n\u003cdiv class='mr-1'\u003e\n\u003ca class=\"btn btn-success\" data-posthog-event=\"Signup: LP Signup Activity\" data-posthog-location=\"body_link_boclips\" data-remote=\"true\" href=\"/subscription/new\"\u003e\u003cspan\u003e\u003cspan\u003eGet Free Access\u003c/span\u003e\u003cspan class=\"\"\u003e for 10 Days\u003c/span\u003e\u003cspan\u003e!\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-body'\u003e\n\u003cdiv class='rp-info'\u003e\n\u003cdiv aria-label='Hide resource details' class='rp-hide-info' role='button' tabindex='0'\u003e\u0026times;\u003c/div\u003e\n\u003ci aria-label='Expand resource details' class='rp-expand-info fai fa-solid fa-up-right-and-down-left-from-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003ci aria-label='Compress resource details' class='rp-compress-info fai fa-solid fa-down-left-and-up-right-to-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003cdiv class='rp-rating'\u003e\n\u003cspan class='resource-pool'\u003e\n\u003cspan class='pool-label'\u003ePublisher:\u003c/span\u003e\n\u003cspan class='pool-name'\u003e\n\u003cspan class='text'\u003e\u003ca data-publisher-id=\"30356011\" href=\"/search?publisher_ids%5B%5D=30356011\"\u003eCurated Video\u003c/a\u003e\u003c/span\u003e\n\u003c/span\u003e\n\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-description'\u003e\n\u003cspan class='short-description'\u003eResearch has revealed that bluefin tuna caught on the shores of the United States was contaminated with radiation that leaked from Japan's crippled nuclear plant 6-thousand miles (9,650 kilometres) away.It's the first time a migrating...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eResearch has revealed that bluefin tuna caught on the shores of the United States was contaminated with radiation that leaked from Japan's crippled nuclear plant 6-thousand miles (9,650 kilometres) away.\u003cbr/\u003eIt's the first time a migrating species has been shown to carry radioactivity such a distance.\u003cbr/\u003e\"We calculated that they took about three to four months to swim across the Pacific and we were surprise to see that they had accumulated enough radioactivity that it survived that transit across the Pacific,\" said Professor Nicholas Fisher, Professor of Biological and Chemical Oceanography at Stony Brook University in New York.\u003cbr/\u003eThe levels of radioactive caesium were 10 times higher than the amount measured in tuna off the California coast in previous years. \u003cbr/\u003eBut even so, that's still far below safe-to-eat limits set by the US and Japanese governments.\u003cbr/\u003ePreviously, smaller fish and plankton were found with elevated levels of radiation in Japanese waters after a magnitude-9 earthquake in March 2011 triggered a tsunami that badly damaged the Fukushima Dai-ichi reactors.\u003cbr/\u003eBut scientists did not expect the nuclear fallout to linger in large fish that sail the world because such fish can metabolise and shed radioactive substances.\u003cbr/\u003eFive months after the Fukushima disaster, Fisher of Stony Brook University in New York and a team decided to test Pacific bluefin that were caught off the coast of San Diego. \u003cbr/\u003eTo their surprise, tissue samples from all 15 tuna captured contained levels of two radioactive substances - caesium-134 and caesium-137 that were higher than in previous catches.\u003cbr/\u003eTo rule out the possibility that the radiation was carried by ocean currents or deposited in the sea through the atmosphere, the team also analysed yellowfin tuna, found in the eastern Pacific, and bluefin that migrated to Southern California before the nuclear crisis. \u003cbr/\u003eThey found no trace of caesium-134 and only background levels of caesium-137, left over from nuclear weapons testing in the 1960s.\u003cbr/\u003eBluefin tuna absorbed radioactive caesium from swimming in contaminated waters and feeding on contaminated prey such as krill and squid, the scientists said. \u003cbr/\u003eAs the predators made the journey east, they shed some of the radiation through metabolism and natural growth. \u003cbr/\u003eEven so, they weren't able to completely flush out all the contamination from their system.\u003cbr/\u003ePacific bluefin tuna are prized in Japan where a thin slice of the tender red meat prepared as sushi can fetch 24 US Dollars per piece at top Tokyo restaurants. \u003cbr/\u003eJapanese consume 80 percent of the world's Pacific and Atlantic bluefin tuna.\u003cbr/\u003eThe real test of how radioactivity affects tuna populations comes this summer when researchers plan to repeat the study with a larger number of samples. \u003cbr/\u003eNow that scientists know that bluefin tuna can transport radiation, they also want to track the movements of other migratory species including sea turtles, sharks and seabirds.\u003cbr/\u003eOne of the largest and speediest fish, Pacific bluefin tuna can grow to 10 feet (3 meters) and weigh more than 1-thousand pounds (450 kilograms). \u003cbr/\u003eThey spawn off the Japanese coast and swim east to school in waters off California and the tip of Baja California, Mexico.\u003cbr/\u003eStony Brook, New York - 29 May 2012 \u003cbr/\u003e1. Wide of research building at Stony Brook University\u003cbr/\u003e2. Mid of desk, pan to Professor Nicholas Fisher, Professor of Biological and Chemical Oceanography at Stony Brook University\u003cbr/\u003e3. SOUNDBITE: (English) Nicholas Fisher, Professor of Biological and Chemical Oceanography at Stony Brook University:\u003cbr/\u003e\"We caught some Bluefin Tuna in San Diego and dissected the muscle tissue out those fish and analysed them with a gama-spectrometer to determine the radioactivity in that muscle tissue, which is the part that we eat.  And we were quite surprised to see two different radio isotopes of caesium, caesium-134 and caesium-137 in these samples.\"\u003cbr/\u003e4. Cutaway of Fisher referring to computer imaging of research\u003cbr/\u003e5. Cutaway of Fisher holding up a sample of free-dried blue-fin muscle tissue\u003cbr/\u003e6. SOUNDBITE: (English) Nicholas Fisher, Professor of Biological/Chemical Oceanography at Stony Brook University:\u003cbr/\u003e\"The Pacific Bluefin Tuna were transporting these radio nuclides from Japan all the way across the Pacific Ocean.  We calculated that they took about three to four months to swim across the Pacific and we were surprise to see that they had accumulated enough radioactivity that it survived that transit across the Pacific.\"\u003cbr/\u003eMonterey, California - 29 May 2012\u003cbr/\u003e7. Various of tuna in tank at Monterey Bay Aquarium\u003cbr/\u003e8. Cutaway of Tom Pickerell, Senior Science Manager, Seafood Watch\u003cbr/\u003e9. SOUNDBITE: (English) Tom Pickerell, Senior Science Manager, Seafood Watch:\u003cbr/\u003e\"Not overly surprised to be honest (referring to the findings). Obviously not only with the scale of the incident in Japan, but also with these highly migratory species which regularly make the journey from the West to the East and the East to the West of the Pacific, so not that surprised.\"\u003cbr/\u003eLos Angeles, California - 29 May 2012\u003cbr/\u003e10. Various shots of sushi restaurant\u003cbr/\u003eMonterey, California - 29 May 2012\u003cbr/\u003e11. SOUNDBITE: (English) Tom Pickerell, Senior Science Manager - Seafood Watch:\u003cbr/\u003e\"The Pacific Bluefin are a very high-value species. They're very much sought after. They're a delicacy in sushi and they can go for vast sums of money at fish auctions, particularly in Japan. This is one of the reasons this stock is so threatened. When you have a high-value species, people are going to want to catch it.\"\u003cbr/\u003e12. 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